402 



THE SKIN AND THE SENSE-ORGANS. 



of a small portion, the membrana basilaris (Hasse) (ml], which closes 

 the opening- into a small dilatation on the anterior inner wall. The 

 ramulus basilaris (rb] divides into, at least, two branches, and passes 

 close to the membrana basilaris (mb), where the elongated and 

 oval papilla ac. basilaris (Fig-. 250 ppb) is placed. The papilla 

 is covered by a membrana tectoria (Fig. 250 mt], which is often 

 found separated from the papilla, probably by the action of the 



JJf 



Preparations from the ear of liana esculcitta ; after Retzius. 



I. Part of the membranous wall seen from the surface. V6rick, Obj. VI, Oc. 3. 

 II. Transverse section of the membranous wall. V6rick, Obj. Ill, Oc. 3. 



III. Epithelium from the neighbourhood of the macula ac. rec. utriculi. V6rick, Obj. Ill, Oc. 3. 

 IV. Branched cells from the yellow spot on the floor of the anterior ampulla. V6rick, Obj. Ill, 



Oc. 3. 

 V. Epithelium from the roof of the anterior ampulla. V6rick, Obj. Ill, Oc. 3. 



re Epithelium of raphe. pe Protoplasmic cells. 



e Pavement epithelium. 7x7 Perilymphatic tissue. 



reagents used. The form of this membrane is peculiar but will 

 easily be understood from the figure (Fig. 250 mt]. In structure 

 it is similar to the corresponding structures found in other parts 

 of the ear. 



(10) The tegmentum vasculosum (Deiters) (Figs. 245, 248, and 

 250 tv) is an oval, shell-shaped dilatation of the membranous laby- 

 rinth ; its long axis is directed from above and in front, downwards 

 and backwards. The walls of the tegmentnm are thin and inti- 

 mately attached to the periosteum. 



e. The minute structure of the membranous labyrinth (Figs. 

 251 



